US5194341A - Silica electrolyte element for secondary lithium battery - Google Patents
Silica electrolyte element for secondary lithium battery Download PDFInfo
- Publication number
- US5194341A US5194341A US07/801,038 US80103891A US5194341A US 5194341 A US5194341 A US 5194341A US 80103891 A US80103891 A US 80103891A US 5194341 A US5194341 A US 5194341A
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- United States
- Prior art keywords
- electrolyte
- layer
- secondary battery
- group
- halogens
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- Expired - Lifetime
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to secondary (rechargeable) batteries which utilize electrodes comprising intercalation compounds, principally lithiated ternary transition metal oxides, such as LiMn 2 O 4 , LiCoO 2 , and LiNiO 2 .
- the invention yields an improved electrolyte element which serves to more effectively separate the battery electrodes while providing a highly functional and economical electrolytic medium for the intercalation process.
- the electrolyte element of the invention is a porous silicate glass film which is prepared in situ from a thin layer of an organosilicon polymer solution typically coated on the surface of one of the secondary battery electrodes. After drying to remove the solvent vehicle, the coating is cured to a glassy film and then subjected to plasma oxidation which removes pendant organic groups from the polymer film.
- the resulting silicate film is replete with microscopic pores formed by the organic group removal and readily takes up and immobily retains by capillarity any of a number of commonly employed electrolyte solutions.
- the invention thus provides a unique combination of the desired high mobility of liquid electrolyte cations and the robustness and permanence of a continuous, non-fluid fenestrated silica network.
- the counter electrode of the battery is then firmly positioned in contact with the electrolyte element separator to complete, with appropriate electrical conductors, the functional assembly of a secondary battery.
- Organosilicon polymers useful in the present invention are the organosilsesquioxane condensation compounds, the so-called “ladder” polymers, described for coating applications by Bagley et al. in Journal of Non-Crystalline Solids, 121 (1990) 457-459 and in U.S. Pat. Nos. 4,835,057 and 4,885,186. These compounds have a silicate backbone and may comprise a number of various organic, e.g., methyl and phenyl, pendant groups. It is apparently the removal of these groups during the plasma oxidation operation that yields the minute voids and capillary channels which subsequently fill with electrolyte solution and provide the lithium ion path between electrodes.
- Void volume fraction in the electrolyte element may also be increased by incorporating into the coating composition an organic component, e.g, a polymer, which will be eliminated upon oxidation. Care should be exercised, however, to avoid overly large pore volumes with their increased potential for lithium dendrite penetration.
- an organic component e.g, a polymer
- the coating operation employed in forming the electrolyte element is particularly useful not only for providing a simple and economical method of fabrication, but also in enabling the precise and secure positioning of this component in the battery structure.
- the precursor polymer solution may be varied in polymer content and viscosity and the coating procedure may be any common type, thus providing a broad range of finished separator thicknesses down to a few micrometers.
- the selection of coating substrate is also a simple matter of preference, whether it be desired to locate an ultrathin separator adherent to the surface of an electrode, for example, or to form a self-sustaining electrolyte element layer on a temporary support for later insertion into a composite battery assembly.
- An organosilsesquioxane polymer precursor for the electrolyte element of the invention has the general formula: ##STR1## wherein R and R' are the same or different radicals selected from the group consisting of aliphatics of 1-4 carbons, phenyl, phenyls substituted with one or more hydroxy or halogen, and halogens, provided R and R' are not both halogen; x 1 , x 2 , x 3 , and x 4 are functional radicals selected from the group consisting of alkoxies of 1-4 carbons, halogens, hydroxyl, and silanol; and n is an integer in the range of 10-200.
- These "ladder" siloxane polymers are commercially prepared by hydrolysis and condensation polymerization of the appropriately substituted silanes.
- Preparation of the electrolyte element begins with the formation of a solution of the selected ladder polymer in an organic solvent.
- This solution adjusted as desired for viscosity and solids composition, is then cast as a coating by any common method, such as spinning, dipping, or the like, onto a selected substrate and dried.
- Moderate heating in the range of about 150°-400° C., depending upon the extent of time, cures the coating to a glass-like state that is insoluble in organic solvents.
- the ready formation of precursor polymer layers in this manner provides a particular advantage in allowing the precise positioning of electrolyte elements of minimal and consistent thickness in the final battery structure. Coating upon a battery electrode component, for example, locates the electrolyte element in its desired position throughout battery assembly, thereby simplifying that operation and ensuring proper and secure element arrangement.
- the cured precursor polymer layer is then processed to remove the pendant radical groups and impart to the remaining silica layer an intricate network of minute voids, the sizes of which generally vary, down to about 10 nm, with the sizes of the respective radicals.
- This processing may comprise heating in air or oxygen in the range of 600°-1000° C., but the deleterious effects of such temperatures are avoided and the processing made far more practical by the preferred barrel reactor plasma oxidation at room temperature.
- the fenestrated silica layer is then prepared for incorporation into a battery assembly by filling the voids network with the desired electrolyte solution, typically a lithium compound, such as LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , or LiB(C 6 H 5 ) 4 , in a suitable organic solvent.
- the desired electrolyte solution typically a lithium compound, such as LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , or LiB(C 6 H 5 ) 4
- Loading the electrolyte is simply a matter of application to the element surface where the solution is taken in by the natural capillarity of the dispersed voids network. Completely filling the smallest voids may be facilitated by prior evacuation of the voids or application of the solution under pressure. Once loaded into the voids matrix network, the electrolyte is substantially immobilized with little danger of leakage or migration within the finished battery assembly.
- a secondary battery 10 incorporating an electrolyte element of the invention is depicted in the drawing Figure.
- This representative structure comprises positive electrode 19 which may be one of the many available intercalatable materials, for example TiS 2 , TiS x O y , or AgMo 6 S 8 , which have been employed with lithium electrodes, or, preferably, one of the more functional lithiated ternary transition metal oxides, such as LiMn 2 O 4 , Li 2 Mn 2 O 4 , LiCoO 2 , or LiNiO 2 .
- separator/electrolyte element 17 In intimate contact with electrode 19, preferably as an attached coated layer previously described, is separator/electrolyte element 17, the voids matrix of which contains the lithium ion electrolyte solution.
- Negative electrode 15 pressed into firm contact with electrolyte element 17 by means of a swagelock or other compressive assembly device completes the basic battery assembly and may be any of the many known lithium ion sources, for example lithium metal, a lithium alloy, or, preferably, a lithium intercalatable material such as WO 2 , Al, or carbon, which have been shown to be effective with the noted lithiated ternary oxide electrodes.
- Collector plates 14, 18 intimately contacting respective electrodes 15, 19 provide means for attaching electrical conductors 16 through which current flows during the charge and discharge cycles of the battery.
- a preferred secondary battery embodying the present electrolyte element was constructed in the following manner. LiMn 2 O 4 powder, typically prepared by thermal reaction of lithium carbonate and manganese dioxide, was mixed with about one weight percent polytetrafluoroethylene binder and five percent Super -S graphite for improved electrical conductivity. The resulting mixture was compressed to form an electrode wafer 19 about 0.8 mm thick. One face of the wafer was flow coated with an acetylnitrile solution of about 40 weight percent solid GR150, a ladder siloxane commercially obtained from OI-NEG and having methyl and phenyl pendant radicals.
- This coating solution was somewhat limited by its slow conversion to a viscous gel, a condition that appears to be accelerated by its hygroscopicity.
- the coating was thoroughly oven-dried at about 110° C. and then heated for an additional 30 minutes at about 220° C. to complete the curing of the coating to a glassy layer about 50 micrometers thick.
- the uncoated side of the electrode wafer was temporarily covered with a thin foil of aluminum to protect against oxidation of the LiMn 2 O 4 surface which could otherwise result in loss of contact conductivity.
- the assembly was placed in a barrel plasma oxidation reactor with the siloxane surface in position for exposure to the plasma.
- the siloxane layer was then oxidized at 13.56 MHz in pure oxygen at a pressure of about one millitor for about three hours during which time the methyl and phenyl radicals were removed from the silica backbone of the compound. This initially clear layer became opaquely white due to light scattering by the dispersed voids matrix formed as a result of removing the pendant radicals.
- a one molar electrolyte solution of LiClO 4 in a mixture of equal parts of diethylene carbonate and diethoxyethane was applied at ambient conditions to the silica layer surface and after a few minutes the surface was blotted dry of excess solution. A decrease in the whiteness of the silica layer evidenced the infusion of electrolyte into the voids matrix.
- a wafer 15 of graphite about 0.7 mm thick was then positioned on the silica layer separator/electrolyte element 17 to serve as the negative electrode of the battery assembly.
- Stainless steel contact plates 14, 18 were placed in intimate contact with the exposed surfaces of electrodes 15, 19 and the assembly was compressed in a swagelock test cell to form battery 10.
- the battery was then charged through conductors 16 during which operation lithium ions migrated through electrolyte element 17 from LiMn 2 O 4 electrode 19 to intercalate graphite electrode 15 which thereafter served as the negative electrode lithium ion source upon discharge of the battery. Charging was discontinued at a predetermined limit of about 4.5 V to prevent decomposition of the electrolyte solvent. The battery was then continually operated through discharge/charge cycles for several weeks. At the conclusion of this test period, the battery was disassembled in order to examine electrolyte element 17 which appeared to be intact with no discernible loss or leakage of electrolyte solution.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/801,038 US5194341A (en) | 1991-12-03 | 1991-12-03 | Silica electrolyte element for secondary lithium battery |
JP5510103A JP2627682B2 (ja) | 1991-12-03 | 1992-10-21 | リチウム電池用のシリカ電解質 |
EP92923308A EP0615656B1 (en) | 1991-12-03 | 1992-10-21 | Silica electrolyte element for secondary lithium battery |
CA002124321A CA2124321C (en) | 1991-12-03 | 1992-10-21 | Silica electrolyte element for secondary lithium battery |
DE69217250T DE69217250T2 (de) | 1991-12-03 | 1992-10-21 | Siliziumdioxid-elektrolytelement für sekundäre lithiumbatterie |
PCT/US1992/009116 WO1993011571A1 (en) | 1991-12-03 | 1992-10-21 | Silica electrolyte element for secondary lithium battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/801,038 US5194341A (en) | 1991-12-03 | 1991-12-03 | Silica electrolyte element for secondary lithium battery |
Publications (1)
Publication Number | Publication Date |
---|---|
US5194341A true US5194341A (en) | 1993-03-16 |
Family
ID=25180031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/801,038 Expired - Lifetime US5194341A (en) | 1991-12-03 | 1991-12-03 | Silica electrolyte element for secondary lithium battery |
Country Status (6)
Country | Link |
---|---|
US (1) | US5194341A (ja) |
EP (1) | EP0615656B1 (ja) |
JP (1) | JP2627682B2 (ja) |
CA (1) | CA2124321C (ja) |
DE (1) | DE69217250T2 (ja) |
WO (1) | WO1993011571A1 (ja) |
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US5882721A (en) * | 1997-05-01 | 1999-03-16 | Imra America Inc | Process of manufacturing porous separator for electrochemical power supply |
US5948464A (en) * | 1996-06-19 | 1999-09-07 | Imra America, Inc. | Process of manufacturing porous separator for electrochemical power supply |
US5965299A (en) * | 1997-06-23 | 1999-10-12 | North Carolina State University | Composite electrolyte containing surface modified fumed silica |
US6045950A (en) * | 1998-06-26 | 2000-04-04 | Duracell Inc. | Solvent for electrolytic solutions |
US6148503A (en) * | 1999-03-31 | 2000-11-21 | Imra America, Inc. | Process of manufacturing porous separator for electrochemical power supply |
US6153337A (en) * | 1997-12-19 | 2000-11-28 | Moltech Corporation | Separators for electrochemical cells |
US6183901B1 (en) | 1998-12-17 | 2001-02-06 | Moltech Corporation | Protective coating for separators for electrochemical cells |
WO2001039302A1 (en) | 1999-11-23 | 2001-05-31 | Moltech Corporation | Lithium anodes for electrochemical cells |
US6277514B1 (en) | 1998-12-17 | 2001-08-21 | Moltech Corporation | Protective coating for separators for electrochemical cells |
US6316142B1 (en) | 1999-03-31 | 2001-11-13 | Imra America, Inc. | Electrode containing a polymeric binder material, method of formation thereof and electrochemical cell |
US6316149B1 (en) | 1998-08-06 | 2001-11-13 | Minnesota Mining And Manufacturing | Solid polymer electrolyte compositions |
US6329789B1 (en) | 1999-12-21 | 2001-12-11 | Moltech Corporation | Methods of charging lithium-sulfur batteries |
US20020012846A1 (en) * | 1999-11-23 | 2002-01-31 | Skotheim Terje A. | Lithium anodes for electrochemical cells |
US6344293B1 (en) | 2000-04-18 | 2002-02-05 | Moltech Corporation | Lithium electrochemical cells with enhanced cycle life |
US6403263B1 (en) | 2000-09-20 | 2002-06-11 | Moltech Corporation | Cathode current collector for electrochemical cells |
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US6482545B1 (en) | 1998-06-08 | 2002-11-19 | Moltech Corporation | Multifunctional reactive monomers for safety protection of nonaqueous electrochemical cells |
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US6544689B1 (en) | 1999-06-30 | 2003-04-08 | North Carolina State University | Composite electrolytes based on smectite clays and high dielectric organic liquids and electrodes |
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US6569573B1 (en) | 1999-11-12 | 2003-05-27 | Moltech Corporation | Lithium batteries |
US6572978B1 (en) | 1994-05-24 | 2003-06-03 | Brian G. Bagley | Method of making wood composition boards resistant to water permeation |
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1991
- 1991-12-03 US US07/801,038 patent/US5194341A/en not_active Expired - Lifetime
-
1992
- 1992-10-21 CA CA002124321A patent/CA2124321C/en not_active Expired - Fee Related
- 1992-10-21 JP JP5510103A patent/JP2627682B2/ja not_active Expired - Lifetime
- 1992-10-21 EP EP92923308A patent/EP0615656B1/en not_active Expired - Lifetime
- 1992-10-21 DE DE69217250T patent/DE69217250T2/de not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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JPH07501649A (ja) | 1995-02-16 |
EP0615656A4 (en) | 1995-07-05 |
EP0615656A1 (en) | 1994-09-21 |
JP2627682B2 (ja) | 1997-07-09 |
DE69217250D1 (de) | 1997-03-13 |
DE69217250T2 (de) | 1997-08-28 |
EP0615656B1 (en) | 1997-01-29 |
WO1993011571A1 (en) | 1993-06-10 |
CA2124321C (en) | 1997-09-23 |
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